Interested to Buy Any Domain ? << Click Here >> for more details...
what is difference between userlevel threads and kernel
level threads ?what are the trades offs between these two
approaches ? what approach is most frequently used and why ?
- 1 Answers
- 5932 Views
- I also Faced
- E-Mail Answers
Answer Posted / sneha
*A user thread is normally created by a threading library and scheduling is managed by the threading library itself (Which runs in user mode). All user threads belong to process that created them. The advantage of user threads is that they are portable.
*A kernel thread, sometimes called a LWP (Lightweight Process) is created and scheduled by the kernel. Kernel threads are often more expensive to create than user threads and the system calls to directly create kernel threads are very platform specific.
*The major difference can be seen when using multiprocessor systems, user threads completely managed by the threading library can't be ran in parallel on the different CPUs, although this means they will run fine on uniprocessor systems. Since kernel threads use the kernel scheduler, different kernel threads can run on different CPUs.
Many systems implement threading differently,
*A many-to-one threading model maps many user processes directly to one kernel thread, the kernel thread can be thought of as the main process.
*A one-to-one threading model maps each user thread directly to one kernel thread, this model allows parallel processing on the multiprocessor systems. Each kernel thread can be thought of as a VP (Virtual Process) which is managed by the scheduler.
| Is This Answer Correct ? | 7 Yes | 3 No |
Post New Answer View All Answers
What is null in c?
What is the function of volatile in c language?
Why is c called a structured programming language?
What's the total generic pointer type?
Why does this code crash?
What is the difference between char array and char pointer?
Explain what is the difference between #include and #include 'file' ?
How to get string length of given string in c?
How can I find the modification date of a file?
What is a node in c?
Some coders debug their programs by placing comment symbols on some codes instead of deleting it. How does this aid in debugging?
Is c compiled or interpreted?
What are the different types of C instructions?
How to create struct variables?
Can we access the array using a pointer in c language?
